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driver/uart: Introduce a way for mainboard to override the baudrate

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The rationale is to allow the mainboard to override the default
baudrate for instance by sampling GPIOs at boot.

A new configuration option is available for mainboards to select
this behaviour. It will then have to define the function
get_uart_baudrate to return the computed baudrate.

Change-Id: I970ee788bf90b9e1a8c6ccdc5eee8029d9af0ecc
Signed-off-by: Julien Viard de Galbert <jviarddegalbert@online.net>
Reviewed-on: https://review.coreboot.org/23713
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Julien Viard de Galbert 2018-02-20 11:45:48 +01:00 • committed by Martin Roth
commit 235daa4bf6
16 changed files with 42 additions and 21 deletions
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2
src/cpu/allwinner/a10/uart.c
View file

@ -105,7 +105,7 @@ void uart_init(int idx)
struct a10_uart *uart_base = uart_platform_baseptr(idx);
/* Use default 8N1 encoding */
a10_uart_configure(uart_base, CONFIG_TTYS0_BAUD,
a10_uart_configure(uart_base, get_uart_baudrate(),
8, UART_PARITY_NONE, 1);
a10_uart_enable_fifos(uart_base);
}

2
src/cpu/allwinner/a10/uart_console.c
View file

@ -44,7 +44,7 @@ void uart_fill_lb(void *data)
struct lb_serial serial;
serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE);
serial.baud = CONFIG_TTYS0_BAUD;
serial.baud = get_uart_baudrate();
serial.regwidth = 1;
serial.input_hertz = uart_platform_refclk();
serial.uart_pci_addr = 0;